WLAN Encryption

I have a WLAN module which enables a serial device to connect to a network through wifi and send TCP/UDP packets. But the module only supports WEP64/128 encryption. But if I'm not mistaken, most routers are configured to use WPA encryption since WEP is not so secure.

Is there a way to make the module work without changing the security encryption of the router?

This is a common problem with legacy devices, the legacy devices will usually only have WEP encryption so you will probably have to just change your settings on your router. Depending on what brand and model the said "device" is you might be able to do a firmware update to allow you to connect to a WPA network. As of right now you have 3 options.
1. Downgrade your router to WEP
2. Take your encryption off (not recommended)
3. Update your firmware, providing that it is possible

There are some theory work around that include bridging 2 wireless networks, I'm not going over them right now because I think they are not worth trying. ( too much of a pain )

1. The device is actually a serial device (UART). I'm just planning to add a WLAN module which uses serial net to changes serial data to TCP/IP packets. Since I will be selling the product, is it advisable to recommend my client to downgrade the security encryption to be able to use my product?

2. Ok. I guess it is a better option to use WEP than no encryption at all.

3. There's no update that enables WPA encryption. :(

Is there no way to configure a router to maybe enter a list of MAC addresses with different encryption mode?

1. This would be at your discretion. Recommending a downgrade in security is something your going to have to explain to your customer and explain why. In my opinion, if this client is a bank or a "compliance" client then i would not recommend a downgrade, but it it is for a average user, then I would say use your best judgment on how high the "roaming traffic" is around the access point. There are goods and bads about both ways your just have to weigh them out.

2. yes that was actually just kinda a joke for security buffs ;)

3. No, a wireless connection can only be 1 Encryption, don't be confused with routers that say they support all encryptions, because they do, just not all at once

4. and finally just because I think this would be your easiest solution- Throw another WAP onto your current router, a WAP from cisco/linksys runs about 100 dollars for a entry level, and create a separate WAP SSID for your device

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IN general WEP is inadvisable to use for most applications as it can be trivially cracked using commonly available tools. Essentially WEP is barely better than no encryption at all. Where WEP is absolutely needed I usually recommend installing a second wireless network that not directly connect to any important systems, usually isolated behind a firewall. The only wireless router I have seen that supports more than one encryption protocols are either very high end or flashed access point software like dd-wrt.

I'm not very familiar with networking and have never worked with WAPs. Since this question was already closed, I will ask another (general) question about configuring WAPs and the security concerns you raised.